486 -On Aquatic Carnivorous Coleoptera or Dytiscide. 
The male has the front and middle tarsi a little dilated, and the inner claw of the 
front foot longer and thicker than the outer ; jomts 3-7 of the antenne are shehtly 
stouter than in the female. 
I am not quite sure that the North American specimens may not prove a distinct 
species, but I have not specimens of this rare species sufficient to judge from. 
Leconte has called this North American form H. conoideus. 
Northern Europe, Siberia, and North America. (Sweden ; Finland, to 66° 20’ North, Sahlberg ; Britain, 
Germany, Canada, Lake Superior, Vancouver's land). 221. 
647. Hydroporus lugubris, Aubé, M.C.—Oblongo-ovalis, elongatus, sine pubes- 
centia, sat nitidus, nigricans, elytrorum epipleuris clypeoque anterius dilutioribus, 
antennis pedibusque ferrugineis ; prothorace subtilissime sparsim punctulato,-elytris 
sparsim conspicue punctatis ; coxis posterioribus evidenter elongato-punctatis ; 
prosterni processu evidenter tricarimato. Long. 45, lat. 25 m.m. 
South America, (Monte Video). 226. 
648. Hydroporus copelatoides, n. sp.—Oblongo-ovalis, elongatus, sine pubescentia, 
sericeo-subopacus, nigricans, antennis pedibusque rufescentibus, corpore supra sparsim 
subtiliter punctato, subtus fere impunctato, punctis elytrorum subelongatis; prosternl 
processu medio fortiter earinato. Long. 43, lat. 23 m.m. 
This species bears much resemblance to the European and North American 
Hydroporus oblongus, but the prosternal process 1s more carinate along the middle. 
649. Hydroporus advena, n. sp.—Ovalis, sine pubescentia, sat nitidus, niger, 
supra fusco-testaceus, prothoracis macula magna discoidali elytrorumque sutura 
angustissime nigricantibus ; thorate subtilissime punctulato, elytris sat crebre et 
sat fortiter punctatis, punctis subelongatis; corpore subtus nitido fere impunctato ; 
coxis intermediis sat distantibus, prosterni processu apicem versus latiore ; pedibus 
3 
antennarumque basi testaceis. Long. 24, lat. 12 m.m. 
In the male the front and middle tarsi are a little dilated. 
South Africa, (Cape Town). 228. 
